Natural ametrine quartz, 15.87 carats, cushion mixed cut, brownish yellow and purple transparent coloration, IGI certified gemstone

Ametrine 15.87 ct – IGI certificate

Name: Ametrine 15.87 ct – IGI certificate
Brand: SOSNA Gems & Jewellery
Price: 22586.00 CZK
Availability: InStock

22.586,00 CZK

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Gemstone Specification

Carat Weight 15.87

Dimensions 16.08 x 13.69 x 9.47 mm

Color Bicolor - Brownish Yellow / Purple

Clarity Eye Clean

Shape Cushion

Treatment No Treatment

Origin Bolivia

Certification IGI

This natural ametrine quartz weighs an impressive 15.87 carats and displays a captivating combination of brownish yellow and purple hues with excellent transparency and vibrant brilliance. The gemstone is expertly fashioned in a cushion mixed cut measuring 16.08 × 13.69 × 9.47 mm, enhancing the natural color zoning and creating remarkable depth and light reflection. Ametrine is a unique quartz variety formed naturally from both amethyst and citrine within a single crystal, making every gemstone visually distinctive.

The gemstone features natural internal characteristics, confirming its authentic natural origin and individuality. Certified by the International Gemological Institute (IGI), this ametrine comes with independent verification of its gemstone identity and natural properties, providing additional confidence for collectors and buyers. The cushion mixed cut emphasizes both the warm golden tones and rich purple coloration while maximizing brilliance and symmetry.

Its substantial carat weight, elegant bi-color appearance, and IGI certification make this ametrine an exceptional centerpiece gemstone for collectors and bespoke luxury jewelry creations.

Ametrine 15.87 ct – IGI certificate

22.586,00 CZK

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Gemological overview

Technical and gemological information about this gemstone variety.

Gemological profile

Ametrine is a naturally occurring bicolor variety of quartz, combining purple amethyst and golden citrine within a single crystal. It is valued for its distinctive color zoning, which creates a clear visual contrast between violet and yellow tones, making each stone inherently unique.
Chemically composed of silicon dioxide (SiO₂), ametrine belongs to the silicate mineral group and crystallizes in the trigonal crystal system, like other quartz varieties. In gem-quality specimens, it typically displays a vitreous luster and transparent clarity.
The refractive index of ametrine generally ranges from 1.544 to 1.553, resulting in a soft, balanced brilliance rather than strong dispersion. Natural ametrine is found almost exclusively in Bolivia, where geological conditions allow the coexistence of both color zones within a single crystal.

Durability & suitability

Ametrine is a naturally occurring bicolor variety of quartz, combining purple amethyst and golden citrine within a single crystal. It is valued for its distinctive color zoning, which creates a clear visual contrast between violet and yellow tones, making each stone inherently unique.
Chemically composed of silicon dioxide (SiO₂), ametrine belongs to the silicate mineral group and crystallizes in the trigonal crystal system, like other quartz varieties. In gem-quality specimens, it typically displays a vitreous luster and transparent clarity.
The refractive index of ametrine generally ranges from 1.544 to 1.553, resulting in a soft, balanced brilliance rather than strong dispersion. Natural ametrine is found almost exclusively in Bolivia, where geological conditions allow the coexistence of both color zones within a single crystal.

Treatments & authenticity

With a hardness of 7 on the Mohs scale, ametrine offers good durability suitable for everyday jewelry when properly set and worn with standard care. It performs reliably in a variety of designs, particularly in pendants, earrings, and rings with protective settings.
Due to its characteristic color zoning, ametrine is often cut to emphasize the contrast between amethyst and citrine areas, making orientation and setting especially important. Its combination of durability, visual interest, and size availability makes it well suited for expressive, statement-oriented jewelry designs as well as distinctive everyday pieces.

Our approach to gemstones

We focus primarily on natural, untreated gemstones, valued for their authenticity and inherent beauty.
Any treatments or enhancements are always clearly disclosed, allowing our clients to make informed decisions based on transparent gemological standards.

Sosna Gems is not a licensed financial advisor. Gemstones are collectibles, not securities. Past performance is not indicative of future results. Legal & risk disclosure .